>> bill and denise richard of dorchester, massachusetts, a civic-minded family, a friend told anderson cooper, close-knit. >> we always thought of them as one unit, singular, the richards. they were always together anywhere they go. and that's no longer the case. >> 8-year-old martin was killed. he loved the boston bruins, the red sox, and pictionary. >> every time i baby sit him, as soon as i came to the door, he ran towards me. he had a bright smile that nobody could ever forget. >> martin's mother, denise richard, was a librarian at a school. she suffered severe head injuries. martin's 7-year-old sister jane who loves to dance lost a leg. >> she's an irish step dancer, loves it. everyone i've talked to, the one thing they said, if anyone's going to bounce back from this, it's jane. she's a pistol.